I like the concept and the blending overall is pretty good, the gent sitting down needs some touch up in the offset + saturation category.
My only gripe with this image is this line in the image.
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Now i understand its supposed to mind ****, but it just doesn't match the rest of the image,
everything else has a blending point where this appears to be a fold as if turning a page which would be fine if you made the rest of the design to match.
Perhaps trying a spherical warp of the stock image you can replace that corner with something that matches a bit better.
Just a thought.